Re: LF: 500 kHz WSJT JT4A

[Andy Talbot <andy.g4jnt@googlemail.com>]

Overlapping emails :-)

 

Think this was answered in the one just sent.   JT4 and JT65 have similar input message formats, its just the to-air coding and FEC technique that is very different  

They don't offer the same type of messages as WSPR does

 
Andy
www.g4jnt.com

2010/1/19 Gary - G4WGT <g4wgt@tiscali.co.uk>

Hi Andy,

Had a quick look at the pdf, I think I partially understand.

Does it mean that the other JT4 modes are different in the character format which can be used (transmitted)??

I will modify the message to 13 characters in the mean time.

73

Gary.

2010/1/19 Andy Talbot <andy.g4jnt@googlemail.com>

In its plain text mode which you have used, it can cope with just 13 characters.   See http://www.g4jnt.com/Coding/JT4_Coding_Process.pdf   and the WSJT documantation

Andy
www.g4jnt.com

2010/1/19 Gary - G4WGT <g4wgt@tiscali.co.uk>

Hi Ko,

Thanks for the decode, not bad a -10 db at one point.

There must be a character limit on the Tx text box (Tx1) I have used as there is more than you have decoded. I will try placing the same text into the Tx6 box & see if it sends more or all.

73

Gary - G4WGT.

2010/1/19 Ko Versteeg <nl9222@xs4all.nl>

Gary - G4WGT wrote:

Hi All,

For a while tonight I am transmitting a beacon on 503.600 kHz.

The mode of operation is WSJT JT4A, transmitting on even minutes.

Only using 15 watts RF & ERP 100 mW.

If anyone would like to try & decode the message, post the results on LF & I will confirm correct or not as the case may be.

Sorry, no prizes :-((



73

Gary - G4WGT.

Hi Gary
Just received:

200200  6  -11  0.1 -477 31 *      TEST G4WGT IO             1   0
200300  0  -33  5.1 -451 42
200400 22  -10  0.1 -477 24 *      TEST G4WGT IO             1   0

73 Ko, NL9222 - JO22ke